| abstract |
The present invention provides a container in a back-in box having good bending fatigue resistance even after heat sealing. An ethylene-vinyl alcohol copolymer is an ethylene-vinyl alcohol copolymer containing the following structural unit (1), preferably 3,4-diacyloxy-1-butene, a vinyl ester monomer, and ethylene. At least one thermoplastic resin-containing layer is laminated on one side or both sides of a layer having an ethylene-vinyl alcohol copolymer obtained by saponifying a copolymer obtained by copolymerization. (Here, X is a bond chain and is an arbitrary bond chain excluding an ether bond, R1 to R4 are each independently an arbitrary substituent, and n represents 0 or 1.) [Selection figure] None |